Abstract: A drilling assisting device for a drill used for diamond drilling, has a supporting element, a unit for mounting on a drill arranged on the supporting element at a machine side, a support part for supporting the drill on a surface to be treated and also mounted on the supporting element at a tool side, the unit for mounting on the drill having a carriage, a dove-tail unit for setting the carriage on the drill, and a bolt unit mounting the carriage on the drill.

Abstract: A drilling device for drilling with diamond tools has a drilling head having a drilling head housing, a drilling shaft rotatably supported in the housing, the drilling shaft having a tool side and being provided with a receiving opening for a drilling tool and extending from the tool side, the drilling shaft being formed as a hollow shaft over a part of its axial length, a drive having a rotary spindle, coupling means for connecting the drilling shaft with the rotary spindle of the drive, the drilling shaft being provided with at least one radial interruption for connecting an interior of the drilling shaft with an interior of the drilling head housing, the drilling head housing having an opening for selective connection of a supply conduit for a cooling/lubricating medium and a suction conduit for drilled material, and a clamping element for releasably connecting the drilling head with a clamping neck of the drive.